High Quality Content by WIKIPEDIA articles! Any Human Heart: The Intimate Journals of Logan Mountstuart is a 2002 novel by William Boyd, a Scottish writer. It is written as a lifelong series of journals kept by the protagonist, Logan Mountstuart, a writer whose life (1906–1991) spanned the defining episodes of the twentieth century, crossed several continents and included a convoluted sequence of relationships and literary endeavours. Boyd uses the diary form as a means of exploring how public events impinge on individual consciousness, so that Mountstuart’s journal alludes almost casually to the war, the death of a prime minister or the abdication of the king.